Plug and socket for telephone systems.



(Application med Apr. 2e, 1899.,

LNo Model.)

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UNITED STATES PATENT OFFICE..

WILLIAM w. DEAN, OE CHICAGO, ILLINOIS, ASSIGNOE To THE kELLoee SWITCHBOARD AND SUPPLY COMPANY, OF SAME PLACE.

PLUG AND SOCKET FOR TELEPHONE SYSTEMS.

SPECIFICATION formingpart of Letters Patent N o. 657,339, datedSeptember 4, 1900.

Application nea April 2s, 1899. Santino. 714,872. Nomodei.)

To all whom t may concern:

Bc it known that I, WILLIAM W. DEAN, a Citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Plugs and Sockets forTelephone Systems, of which the following is a full, clear, concise, andexact description, reference being hadto the accompanying drawings,forming a part of this specification.

My invention relates to a plug and socket for telephone systems, myobject being to provide an improved form of socket or springjack switchfor the terminals of the telephoneline, and also to provide an improvedform of connecting-plug for insertion therein when it is desired toconnect 'the telephone-lines for con versation.

I have illustrated my invention in the accom panying drawings, inuwhich- Figure l is a sectional view illustrating the plug inserted inthe socket. Fig. 2 is a sectional view on line 2 2, Fig. 1.

Like letters refer to like parts in both figures.

The socket comprises a part a, having an opening through which the plugmay be inserted and is also provided with a line-spring b, the end ofwhich is arranged to engage a contact upon the plug and also carries arigid or infiexible contact o. The plug comprises an insulating-sleeve dto serve as a handle, within which is arranged a metallic shell d', theforward end of which in the present instance serves as a terminal of theplug and is adapted when the plug is inserted in the socket to restwithin and make contact with the metallic part or sleeve a, having theopening for the reception of the plug. Within the metallic shell d is aninsulating-shell d2, and within the latter is a conducting-shell d3, theouter end of whichis enlarged to form the terminal d4, with' which theend of line-spring b is adapted to engage and make Contact. Within theshell d3 is an insulating-body d, through which` passes a rod d5. ofconducting material, the forward end of the rod extending beyond thebody of insulating material d8 and constituting a spring-terminaladapted to engage the rigid contact c. The end d of the rod d5 isenlarged and is adapted to engage a lateral extension c on the rigidcontact to insure the making of an effective contact and to hold theplug in place. A recess or opening dT is provided in the forward end ofthe insulating-body ds'to aiford space to permit the lateral flexing ofcontact-rod d5.

When the plug is inserted in the springjack, the engagement of thecylindrical portion of the plug with the Opening through the part aserves to hold the plug in proper position and the line-spring b engagesthe terminal d4 of the plug, while the spring-tip b5 of thet plugengages the rigid contact c of the spring-jack, the `enlarged end of thespringterminal and the lateral extension on the rigid contact serving toeffectively hold the plug in position.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

l. In com bination,a telephone switch-socket having an opening for theinsertion of the plug and provided with a central rigid terminal and aspring-terminal at one side thereof, and a plug having a portion to restWithin the socket-opening and carrying a central spring rod or terminalto engage the rigid switch- Contact and an outer terminal to engage thespring-contact of the switch, substantially as described.

2. In combination,a telephone switch-socket having a spring-contact anda rigid central Contact having a lateral extension on lthe end, and aplug having a contact to engage said spring-contact and a spring rod orterminal havinga lateral extension on the end and adapted to engage saidrigid contact, substantially as described.

Inwitness whereof I have hereunto subscribed my name in the presence oftwo witmesses.

WILLIAM W. DEAN.

Witnesses:

W. CLYDE JONES, PERCY C. GILL.

